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ID 116760
Author
Keywords
Magneto-optical effect
Subwavelength grating
Surface plasmon polariton
Polar Kerr effect
Content Type
Journal Article
Description
An extreme enhancement of the polar Kerr magneto-optical (MO) effect was numerically demonstrated using surface plasmon polaritons (SPPs) at the SiO2/Ni interface combined with the Ni-subwavelength grating (SWG). Utilizing the ω-k dispersion relation for the SPP at the SiO2/Ni interface, the parameters of Ni-SWGs were designed to couple the SPP mode with the incident light. The electromagnetic field distribution was calculated using the finite-difference time-domain method to estimate and discuss the enhancement of MO effect in the designed structure. The results indicated that the reflectance of light for the designed structure dramatically decreased owing to SPP excitations. The field distributions revealed that the high electric field of the SPP was concentrated not only on the Ni substrate but also on Ni-SWG, yielding Kerr rotation angle 224 times higher than that without SPP. The results provide a new method for enhancing the MO effect; the extremely large MO enhancement achieved by our structure has a great potential for use in a wide range of applications.
Journal Title
Optical Review
ISSN
13499432
Publisher
Springer Nature|The Optical Society of Japan
Volume
29
Issue
1
Start Page
62
End Page
67
Published Date
2022-01-11
Remark
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use (https://www.springernature.com/gp/open-research/policies/accepted-manuscript-terms), but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s10043-021-00711-2
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language
eng
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departments
Science and Technology